> otool-L / opt/local/lib/libiconv.2.dylib
/opt/local/lib/libiconv.2.dylib:
/opt/local/lib/libiconv.2.dylib (compatibility version 8.0.0, current version 8.0.0)
/usr/lib/lib System.B.dylib (compatibility version 1.0.0, current version 125.0.1)

I struggled for hours trying to fix this issue, but was at a loss. Then I viewed already installed libiconv:
> sudo port installed libiconv
The following ports are currently installed:
libiconv@1.13_0
libiconv@1.13.1_0 (active)

I tried switching back to the older version
> sudo port activate libiconv@1.13_0

And voila, the switch resolved the issue. Hope this helps people that encounter this.